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Castle — This article is about medieval fortifications. For other uses, see Castle (disambiguation). For a list of all castles, see List of castles. For similar but unrelated structures in Japan, see Japanese castle … Wikipedia

Keep — For other uses, see Keep (disambiguation). Donjon redirects here. For the role playing game of the same name, see Donjon (role playing game) … Wikipedia

Hill fort — Maiden Castle in England is one of the largest hill forts in Europe.[1][2] Photograph taken in 1935 by Major George Allen (1891–1940). A hill fort is a type of … Wikipedia

Bunker — This article is about the military fortification. For other uses, see Bunker (disambiguation). Bunkers in Albania A military bunker is a hardened shelter, often buried partly or fully underground, designed to protect the inhabitants from falling… … Wikipedia